Single-Shape Morph Product Motion Piece

A finished prompt recipe for product UI motion: one shape on a single canvas that keeps changing size, corner radius and color to string together 8–12 real interface states, driven by a cursor that really clicks, types and drags, locked to a 120 BPM beat, spring motion with only a slight overshoot, matching first and last frames so it loops, and multi-aspect-ratio export. Built for app launches and SaaS promos.